an act or instance of lying concealed so as to attack by surprise

The highwaymen waited in ambush near the road.

an act or instance of attacking unexpectedly from a concealed position.

the concealed position itself

They fired from ambush.

those who attack suddenly and unexpectedly from a concealed position.

to attack from ambush.

noun

ambuscade , ambushment , camouflage , concealment , deception , hiding , hiding place , lurking , pitfall , shelter , trap , trick * , waiting , waylaying

verb

ambuscade , assail , assault , box in , bushwhack , decoy , dry gulch , ensnare , entrap , hem in , hide , hook * , jap , jump , lay for , lurk , net , set trap , surprise , surround , trap , wait , waylay , attack , await , camouflage , lurking , snare , trick